<!DOCTYPE html><html><body><menu type="toolbar"> <li>  <menu label="File">   <button type="button" onclick="file_new()">新建</button>   <button type="button" onclick="file_open()">打开</button>   <button type="button" onclick="file_save()">保存</button>  </menu> </li> <li>  <menu label="Edit">   <button type="button" onclick="edit_cut()">剪切</button>   <button type="button" onclick="edit_copy()">复制</button>   <button type="button" onclick="edit_paste()">粘贴</button>
   inp  </menu> </li></menu><p><b>注释：</b>所有主流浏览器均不支持 menu 元素。</p></body></html>